private void loadError(VolleyError error) {
   progressWheel.setVisibility(View.GONE);
   footerProgressWheel.setVisibility(View.GONE);
   if (Utils.isNetworkError(error) && "".equals(nextPageToken)) {
     Button btnRetry = (Button) rootView.findViewById(R.id.btn_retry);
     btnRetry.setOnClickListener(this);
     btnRetry.setVisibility(View.VISIBLE);
   } else {
     Utils.handleError(getActivity(), error);
   }
 }